Loudness – Volume Booster & Control by Jai Pandya

Make any tab louder, up to 600%, or turn it down. Clean sound with a built-in limiter, bass and voice boost. Free, no ads.

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About this extension

Some videos are still too quiet at full volume. Some tabs are far too loud. Loudness gives every Firefox tab its own level, from silent to 600%, without changing your computer's settings or your other tabs.

When it helps

A lecture, podcast or YouTube video is too quiet, even at max
One video is blasting while you want something else quieter
Dialogue gets lost under music and effects

What you get

Up to 600% louder, in 1% steps, or turn anything down to a whisper
A built-in limiter that keeps boosted audio clean instead of crackling
Bass boost for music, voice clarity for dialogue and podcasts, and mono for one earbud
Everything that's playing, listed in one place, one click away
The toolbar icon shows each tab's level at a glance
Keyboard shortcuts: Alt+Shift+Up/Down to turn the current tab up or down, Alt+Shift+M to mute
Optional per-site memory for your favorite level
Light and dark mode that follows your system

Private by design

Access only to the tab you open Loudness on, and only to adjust its sound
No accounts, ads, analytics or tracking
Sound is processed on your computer and never leaves it

Good to know

Works with the video and audio on most sites, like YouTube. Firefox keeps protected video (like Netflix) and some players embedded from other sites out of reach of extensions; Loudness tells you when a tab can't be adjusted.
Firefox doesn't allow extensions to change sound on its own pages (about:) or on addons.mozilla.org.
Go easy on very high levels: they can be hard on small speakers and on your ears.

Loudness is free, with no ads and no premium tier.

Developer comments

Netflix, Disney+ or Prime Video won't get louder. Why?
Firefox keeps protected (DRM) video out of reach of every extension, so no add-on can change its volume. Loudness tells you when a tab can't be adjusted. Use the player's own volume there.

A video is playing, but Loudness says it can't adjust the player.
Some sites play video in a player embedded from another site. Firefox doesn't let extensions reach those players either. The player's own volume still works.

I reloaded the page and the volume went back to normal.
A new page starts at Firefox's normal volume. Open Loudness or press a shortcut to boost it again. If "Remember volume for each site" is on in Loudness's settings, your level for that site comes back when you do.

How do I change the keyboard shortcuts?
Go to about:addons, click the gear icon, then Manage Extension Shortcuts.

How do I put a tab back to normal?
Open Loudness on that tab and click Reset.

Sound crackles when I turn it up a lot.
Keep the limiter on; it's on by default. Small laptop speakers can only get so loud: past that point, turning it up more mostly makes the sound harsher.

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Loudness – Volume Booster & Control by Jai Pandya

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